From 6607df83cd9501c2d6266109d47591c4a7efcbf5 Mon Sep 17 00:00:00 2001 From: "B. Blechschmidt" Date: Thu, 2 Sep 2021 11:30:23 +0200 Subject: [PATCH] Initial commit --- .gitignore | 3 + Cargo.toml | 12 + LICENSE | 674 ++++++++++++++++++++++++++++++++++++++++++++++ README.md | 50 ++++ src/http.rs | 177 ++++++++++++ src/main.rs | 66 +++++ src/socks5.rs | 225 ++++++++++++++++ src/tun2proxy.rs | 450 +++++++++++++++++++++++++++++++ src/virtdevice.rs | 80 ++++++ 9 files changed, 1737 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.toml create mode 100644 LICENSE create mode 100644 README.md create mode 100644 src/http.rs create mode 100644 src/main.rs create mode 100644 src/socks5.rs create mode 100644 src/tun2proxy.rs create mode 100644 src/virtdevice.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..4b664f2 --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +/target +/.idea +/*.iml diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..cb20b62 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,12 @@ +[package] +name = "tun2proxy" +version = "0.1.0" +authors = ["B. Blechschmidt"] +edition = "2018" + + +[dependencies] +smoltcp = { version="0.8.0", git="https://github.com/smoltcp-rs/smoltcp", features = ["std"], rev="cb1828cbe6d19b10cb50d3e4323fa8c5ca25e5e4" } +mio = { version="0.7", features = ["os-poll", "net", "os-util"]} +clap = { version = "2.33.3" } +chrono = {version = "" } \ No newline at end of file diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/LICENSE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..f08400b --- /dev/null +++ b/README.md @@ -0,0 +1,50 @@ +# tun2proxy +Tunnel TCP traffic through SOCKS5 or HTTP on Linux. + +**Authentication not yet supported. Error handling incomplete and too restrictive.** + +## Build +Clone the repository and `cd` into the project folder. Then run the following: +``` +cargo build --release +``` + +## Setup +A standard setup, which would route all traffic from your system through the tunnel interface, could look as follows: +``` +# Create a tunnel interface named tun0 which your user can bind to. +sudo ip tuntap add name tun0 mode tun user $USER +sudo ip link set tun0 up + +# To prevent a loop, replace 1.2.3.4 with the IP address of the proxy server. +# This will add a route to the proxy server that behaves like the default route. +sudo ip route add 1.2.3.4 $(ip route | grep '^default' | cut -d' ' -f2-) + +# Route all your traffic through tun0 without interfering with the default route. +sudo ip route add 8.0.0.0/1 dev tun0 +sudo ip route add 0.0.0.0/1 dev tun0 + +# Again, replace 1.2.3.4 with the IP address of the proxy server. +./target/release/tun2proxy --tun tun0 --socks5 1.2.3.4 +``` + +Note that if you paste these commands into a shell script, which you then run with `sudo`, you might want to replace +`$USER` with `$SUDO_USER`. + +## CLI +``` +tun2proxy 0.1.0 +Tunnel interface to proxy. + +USAGE: + tun2proxy [OPTIONS] --tun + +FLAGS: + --help Prints help information + -V, --version Prints version information + +OPTIONS: + -h, --http HTTP server to use + -s, --socks5 SOCKS5 server to use + -t, --tun Name of the tun interface +``` \ No newline at end of file diff --git a/src/http.rs b/src/http.rs new file mode 100644 index 0000000..cc312fa --- /dev/null +++ b/src/http.rs @@ -0,0 +1,177 @@ +use crate::tun2proxy::{Connection, TcpProxy, IncomingDirection, OutgoingDirection, OutgoingDataEvent, IncomingDataEvent, ConnectionManager}; +use std::collections::VecDeque; +use std::net::SocketAddr; + +#[derive(Eq, PartialEq, Debug)] +#[allow(dead_code)] +enum HttpState { + SendRequest, + ExpectResponse, + Established +} + +pub struct HttpConnection { + state: HttpState, + client_inbuf: VecDeque, + server_inbuf: VecDeque, + client_outbuf: VecDeque, + server_outbuf: VecDeque, + data_buf: VecDeque, + crlf_state: u8 +} + +impl HttpConnection { + fn new(connection: &Connection) -> Self { + let mut result = Self { + state: HttpState::ExpectResponse, + client_inbuf: Default::default(), + server_inbuf: Default::default(), + client_outbuf: Default::default(), + server_outbuf: Default::default(), + data_buf: Default::default(), + crlf_state: Default::default() + }; + + + result.server_outbuf.extend(b"CONNECT ".iter()); + result.destination_to_server_outbuf(connection); + result.server_outbuf.extend(b" HTTP/1.1\r\nHost: ".iter()); + result.destination_to_server_outbuf(connection); + result.server_outbuf.extend(b"\r\n\r\n".iter()); + + result + } + + fn destination_to_server_outbuf(&mut self, connection: &Connection) { + let ipv6 = connection.dst.is_ipv6(); + if ipv6 { + self.server_outbuf.extend(b"[".iter()); + } + self.server_outbuf.extend(connection.dst.ip().to_string().as_bytes()); + if ipv6 { + self.server_outbuf.extend(b"]".iter()); + } + self.server_outbuf.extend(b":".iter()); + self.server_outbuf.extend(connection.dst.port().to_string().as_bytes()); + } + + fn state_change(&mut self) { + match self.state { + HttpState::ExpectResponse => { + let mut counter = 0usize; + for b_ref in self.server_inbuf.iter() { + let b = *b_ref; + if b == b'\n' { + self.crlf_state += 1; + } else if b != b'\r' { + self.crlf_state = 0; + } + counter += 1; + + if self.crlf_state == 2 { + self.server_inbuf.drain(0..counter); + + self.server_outbuf.append(&mut self.data_buf); + self.data_buf.clear(); + + self.client_outbuf.extend(self.server_inbuf.iter()); + self.server_outbuf.extend(self.client_inbuf.iter()); + self.server_inbuf.clear(); + self.client_inbuf.clear(); + + self.state = HttpState::Established; + return; + } + } + + self.server_inbuf.drain(0..counter); + } + HttpState::Established => { + self.client_outbuf.extend(self.server_inbuf.iter()); + self.server_outbuf.extend(self.client_inbuf.iter()); + self.server_inbuf.clear(); + self.client_inbuf.clear(); + } + _ => { + unreachable!(); + } + } + } +} + + +impl TcpProxy for HttpConnection { + fn push_data(&mut self, event: IncomingDataEvent<'_>) { + let direction = event.direction; + let buffer = event.buffer; + match direction { + IncomingDirection::FromServer => { + self.server_inbuf.extend(buffer.iter()); + }, + IncomingDirection::FromClient => { + if self.state == HttpState::Established { + self.client_inbuf.extend(buffer.iter()); + } else { + self.data_buf.extend(buffer.iter()); + } + } + } + + self.state_change(); + + } + + fn consume_data(&mut self, dir: OutgoingDirection, size: usize) { + let buffer = if dir == OutgoingDirection::ToServer + { + &mut self.server_outbuf + } else { + &mut self.client_outbuf + }; + buffer.drain(0..size); + } + + fn peek_data(&mut self, dir: OutgoingDirection) -> OutgoingDataEvent { + let buffer = if dir == OutgoingDirection::ToServer { + &mut self.server_outbuf + } else { + &mut self.client_outbuf + }; + let event = OutgoingDataEvent { + direction: dir, + buffer: buffer.make_contiguous() + }; + return event; + } +} + +pub struct HttpManager { + server: std::net::SocketAddr, +} + +impl ConnectionManager for HttpManager { + fn handles_connection(&self, connection: &Connection) -> bool { + connection.proto == smoltcp::wire::IpProtocol::Tcp.into() + } + + fn new_connection(&mut self, connection: &Connection) -> Option> { + if connection.proto != smoltcp::wire::IpProtocol::Tcp.into() { + return None; + } + Some(std::boxed::Box::new(HttpConnection::new(&connection))) + } + + fn close_connection(&mut self, _: &Connection) {} + + fn get_server(&self) -> SocketAddr { + self.server + } +} + +impl HttpManager { + pub fn new(server: SocketAddr) -> Self { + Self { + server, + } + } +} \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..5fe71a9 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,66 @@ +#![feature(deque_make_contiguous)] +mod virtdevice; +mod socks5; +mod http; +mod tun2proxy; + +use socks5::*; +use crate::http::HttpManager; +use crate::tun2proxy::TunToProxy; +use std::net::SocketAddr; +use std::str::FromStr; + +fn main() { + let matches = clap::App::new(env!("CARGO_PKG_NAME")) + .version(env!("CARGO_PKG_VERSION")) + .about("Tunnel interface to proxy.") + .arg(clap::Arg::with_name("tun") + .short("t") + .long("tun") + .value_name("TUN") + .help("Name of the tun interface") + .required(true) + .takes_value(true)) + .arg(clap::Arg::with_name("socks5_server") + .help("SOCKS5 server to use") + .short("s") + .long("socks5") + .value_name("IP:PORT")) + .arg(clap::Arg::with_name("http_server") + .help("HTTP server to use") + .short("h") + .long("http") + .value_name("IP:PORT")) + .get_matches(); + + if matches.value_of("socks5_server").is_some() + && matches.value_of("http_server").is_some() + || matches.value_of("socks5_server").is_none() + && matches.value_of("http_server").is_none() { + eprintln!("You need to specify exactly one server."); + return; + } + + let tun_name = matches.value_of("tun").unwrap(); + let mut ttp = TunToProxy::new(tun_name); + if let Some(addr) = matches.value_of("socks5_server") { + if let Ok(server) = SocketAddr::from_str(addr) + { + ttp.add_connection_manager(Box::new(Socks5Manager::new(server))); + } else { + eprintln!("Invalid server address."); + return; + } + } + + if let Some(addr) = matches.value_of("http_server") { + if let Ok(server) = SocketAddr::from_str(addr) + { + ttp.add_connection_manager(Box::new(HttpManager::new(server))); + } else { + eprintln!("Invalid server address."); + return; + } + } + ttp.run(); +} diff --git a/src/socks5.rs b/src/socks5.rs new file mode 100644 index 0000000..fd3a2f7 --- /dev/null +++ b/src/socks5.rs @@ -0,0 +1,225 @@ +use crate::tun2proxy::{Connection, OutgoingDirection, OutgoingDataEvent, IncomingDirection, IncomingDataEvent, ConnectionManager, TcpProxy}; +use std::collections::VecDeque; +use std::net::{IpAddr, SocketAddr}; + +#[derive(Eq, PartialEq, Debug)] +#[allow(dead_code)] +enum SocksState { + ClientHello, + ServerHello, + SendRequest, + ReceiveResponse, + Established +} + +#[allow(dead_code)] +#[repr(u8)] +#[derive(Copy, Clone)] +enum SocksAddressType { + Ipv4 = 1, + DomainName = 3, + Ipv6 = 4 +} + +#[allow(dead_code)] +#[repr(u8)] +enum SocksAuthentication { + None = 0, + Password = 2 +} + +pub struct SocksConnection { + connection: Connection, + state: SocksState, + client_inbuf: VecDeque, + server_inbuf: VecDeque, + client_outbuf: VecDeque, + server_outbuf: VecDeque, + data_buf: VecDeque, +} + +impl SocksConnection { + pub fn new(connection: &Connection) -> Self { + let mut result = Self { + connection: *connection, + state: SocksState::ServerHello, + client_inbuf: Default::default(), + server_inbuf: Default::default(), + client_outbuf: Default::default(), + server_outbuf: Default::default(), + data_buf: Default::default(), + }; + result.server_outbuf.extend(&[5u8, 1, 0]); + result.state = SocksState::ServerHello; + result + } + + fn forward_data(&mut self) { + self.client_outbuf.extend(self.server_inbuf.iter()); + self.server_outbuf.extend(self.client_inbuf.iter()); + self.server_inbuf.clear(); + self.client_inbuf.clear(); + } + + pub fn state_change(&mut self) { + let dst_ip = self.connection.dst.ip(); + + + match self.state { + SocksState::ServerHello if self.server_inbuf.len() == 2 => { + assert!(self.server_inbuf[0] == 5 && self.server_inbuf[1] == 0); + self.server_inbuf.drain(0..2); + + let cmd = if dst_ip.is_ipv4() { 1 } else { 4 }; + self.server_outbuf.extend(&[5u8, 1, 0, cmd]); + match dst_ip { + IpAddr::V4(ip) => self.server_outbuf.extend(ip.octets().as_ref()), + IpAddr::V6(ip) => self.server_outbuf.extend(ip.octets().as_ref()), + }; + self.server_outbuf.extend(&[ + (self.connection.dst.port() >> 8) as u8, + (self.connection.dst.port() & 0xff) as u8 + ]); + + self.state = SocksState::ReceiveResponse; + } + + SocksState::ServerHello if self.server_inbuf.len() > 2 => { + panic!("Socks protocol error!") + } + + SocksState::ReceiveResponse if self.server_inbuf.len() >= 4 => { + let _ver = self.server_inbuf[0]; + let _rep = self.server_inbuf[1]; + let _rsv = self.server_inbuf[2]; + let atyp = self.server_inbuf[3]; + + if atyp != SocksAddressType::Ipv4 as u8 + && atyp != SocksAddressType::Ipv6 as u8 + && atyp != SocksAddressType::DomainName as u8 { + panic!("Invalid address type"); + } + + if atyp == SocksAddressType::DomainName as u8 && self.server_inbuf.len() < 5 { + return; + } + + if atyp == SocksAddressType::DomainName as u8 + && self.server_inbuf.len() < 7 + (self.server_inbuf[4] as usize) { + return; + } + + let message_length = if atyp == SocksAddressType::Ipv4 as u8 { + 10 + } else if atyp == SocksAddressType::Ipv6 as u8 { + 22 + } else { + 7 + (self.server_inbuf[4] as usize) + }; + + self.server_inbuf.drain(0..message_length); + self.server_outbuf.append(&mut self.data_buf); + self.data_buf.clear(); + + self.forward_data(); + self.state = SocksState::Established; + } + + SocksState::Established => { + self.forward_data(); + } + + _ => {} + } + } +} + +impl TcpProxy for SocksConnection { + fn push_data(&mut self, event: IncomingDataEvent<'_>) { + let direction = event.direction; + let buffer = event.buffer; + match direction { + IncomingDirection::FromServer => { + self.server_inbuf.extend(buffer.iter()); + }, + IncomingDirection::FromClient => { + if self.state == SocksState::Established { + self.client_inbuf.extend(buffer.iter()); + } else { + self.data_buf.extend(buffer.iter()); + } + } + } + + self.state_change(); + + } + + fn consume_data(&mut self, dir: OutgoingDirection, size: usize) { + let buffer = if dir == OutgoingDirection::ToServer + { + &mut self.server_outbuf + } else { + &mut self.client_outbuf + }; + buffer.drain(0..size); + } + + fn peek_data(&mut self, dir: OutgoingDirection) -> OutgoingDataEvent { + let buffer = if dir == OutgoingDirection::ToServer { + &mut self.server_outbuf + } else { + &mut self.client_outbuf + }; + let event = OutgoingDataEvent { + direction: dir, + buffer: buffer.make_contiguous() + }; + return event; + } +} + +pub struct Socks5Manager { + server: std::net::SocketAddr, + authentication: SocksAuthentication, + username: Vec, + password: Vec, +} + +impl ConnectionManager for Socks5Manager { + fn handles_connection(&self, connection: &Connection) -> bool { + connection.proto == smoltcp::wire::IpProtocol::Tcp.into() + } + + fn new_connection(&mut self, connection: &Connection) -> Option> { + if connection.proto != smoltcp::wire::IpProtocol::Tcp.into() { + return None; + } + Some(std::boxed::Box::new(SocksConnection::new(&connection))) + } + + fn close_connection(&mut self, _: &Connection) {} + + fn get_server(&self) -> SocketAddr { + self.server + } +} + +impl Socks5Manager { + pub fn new(server: SocketAddr) -> Self { + Self { + server, + authentication: SocksAuthentication::None, + username: Default::default(), + password: Default::default() + } + } + + #[allow(dead_code)] + pub fn set_credentials(&mut self, username: &[u8], password: &[u8]) { + assert!(username.len() <= 255 && password.len() <= 255); + self.authentication = SocksAuthentication::Password; + self.username = Vec::from(username); + self.password = Vec::from(password); + } +} \ No newline at end of file diff --git a/src/tun2proxy.rs b/src/tun2proxy.rs new file mode 100644 index 0000000..7be9556 --- /dev/null +++ b/src/tun2proxy.rs @@ -0,0 +1,450 @@ +use std::collections::{BTreeMap, HashMap}; +use std::convert::From; +use std::io::{Read, Write}; +use std::net::{IpAddr, SocketAddr, Shutdown}; +use std::os::unix::io::AsRawFd; + +use mio::{Events, Interest, Poll, Token}; +use mio::event::Event; +use mio::net::{TcpSocket as MioTcp, TcpStream}; +use mio::unix::SourceFd; +use smoltcp::iface::{Interface, InterfaceBuilder, Routes}; +use smoltcp::phy::{Device, Medium, RxToken, TunTapInterface, TxToken}; +use smoltcp::socket::{SocketHandle, SocketSet, TcpSocket, TcpSocketBuffer}; +use smoltcp::time::Instant; +use smoltcp::wire::{IpAddress, IpCidr, Ipv4Address, Ipv4Packet, TcpPacket, UdpPacket, Ipv6Packet}; +use crate::virtdevice::VirtualTunDevice; + + +#[derive(Hash, Clone, Copy)] +pub struct Connection { + pub src: std::net::SocketAddr, + pub dst: std::net::SocketAddr, + pub proto: u8 +} + +impl Eq for Connection {} + +impl PartialEq for Connection { + fn eq(&self, other: &Self) -> bool { + return other.src == self.src && other.dst == self.dst && other.proto == self.proto; + } +} + +#[derive(Eq, PartialEq, Debug)] +pub(crate) enum IncomingDirection { + FromServer, + FromClient +} + +#[derive(Eq, PartialEq, Debug)] +pub(crate) enum OutgoingDirection { + ToServer, + ToClient +} + +#[allow(dead_code)] +pub(crate) enum ConnectionEvent<'a> { + NewConnection(&'a Connection), + ConnectionClosed(&'a Connection) +} + +pub(crate) struct DataEvent<'a, T> { + pub(crate) direction: T, + pub(crate) buffer: &'a [u8] +} + +pub(crate) type IncomingDataEvent<'a> = DataEvent<'a, IncomingDirection>; +pub(crate) type OutgoingDataEvent<'a> = DataEvent<'a, OutgoingDirection>; + +fn get_transport_info(proto: u8, transport_offset: usize, packet: &[u8]) -> Option<((u16, u16), bool, usize, usize)> { + if proto == smoltcp::wire::IpProtocol::Udp.into() { + match UdpPacket::new_checked(packet) { + Ok(result) => { + Some(((result.src_port(), result.dst_port()), false, transport_offset + 8, packet.len() - 8)) + }, + Err(_) => None + } + } else if proto == smoltcp::wire::IpProtocol::Tcp.into() { + match TcpPacket::new_checked(packet) { + Ok(result) => { + Some(((result.src_port(), result.dst_port()), result.syn() && !result.ack(), + transport_offset + result.header_len() as usize, packet.len())) + }, + Err(_) => None + } + } + else { + None + } +} + +fn connection_tuple(frame: &[u8]) -> Option<(Connection, bool, usize, usize)> { + match Ipv4Packet::new_checked(frame) { + Ok(packet) => { + let proto:u8 = packet.protocol().into(); + + let mut a: [u8; 4] = Default::default(); + a.copy_from_slice(packet.src_addr().as_bytes()); + let src_addr = IpAddr::from(a); + a.copy_from_slice(packet.dst_addr().as_bytes()); + let dst_addr = IpAddr::from(a); + + if let Some((ports, first_packet, payload_offset, payload_size)) + = get_transport_info(proto,packet.header_len().into(), &frame[packet.header_len().into()..]) { + let connection = Connection { + src: SocketAddr::new(src_addr, ports.0), + dst: SocketAddr::new(dst_addr, ports.1), + proto + }; + return Some((connection, first_packet, payload_offset, payload_size)); + } else { + return None; + } + + } + _ => { } + } + + match Ipv6Packet::new_checked(frame) { + Ok(packet) => { + // TODO: Support extension headers. + let proto:u8 = packet.next_header().into(); + + let mut a: [u8; 16] = Default::default(); + a.copy_from_slice(packet.src_addr().as_bytes()); + let src_addr = IpAddr::from(a); + a.copy_from_slice(packet.dst_addr().as_bytes()); + let dst_addr = IpAddr::from(a); + + if let Some((ports, first_packet, payload_offset, payload_size)) + = get_transport_info(proto,packet.header_len().into(), &frame[packet.header_len().into()..]) { + let connection = Connection { + src: SocketAddr::new(src_addr, ports.0), + dst: SocketAddr::new(dst_addr, ports.1), + proto + }; + Some((connection, first_packet, payload_offset, payload_size)) + } else { + None + } + + } + _ => None + } +} + +struct ConnectionState { + smoltcp_handle: SocketHandle, + mio_stream: TcpStream, + token: Token +} + +pub(crate) trait TcpProxy { + fn push_data(&mut self, event: IncomingDataEvent<'_>); + fn consume_data(&mut self, dir: OutgoingDirection, size: usize); + fn peek_data(&mut self, dir: OutgoingDirection) -> OutgoingDataEvent; +} + +pub(crate) trait ConnectionManager { + fn handles_connection(&self, connection: &Connection) -> bool; + fn new_connection(&mut self, connection: &Connection) -> Option>; + fn close_connection(&mut self, connection: &Connection); + fn get_server(&self) -> SocketAddr; +} + +pub(crate) struct TunToProxy<'a> { + tun: TunTapInterface, + poll: Poll, + tun_token: Token, + udp_token: Token, + iface: Interface<'a, VirtualTunDevice>, + connections: HashMap, + managers: HashMap>, + connection_managers: Vec>, + next_token: usize, + token_to_connection: HashMap, + socketset: SocketSet<'a> +} + +impl<'a> TunToProxy<'a> { + + pub(crate) fn new(interface: &str) -> Self { + let tun_token = Token(0); + let tun = TunTapInterface::new(interface, Medium::Ip).unwrap(); + let poll = Poll::new().unwrap(); + poll.registry().register(&mut SourceFd(&tun.as_raw_fd()), tun_token, Interest::READABLE).unwrap(); + + let virt = VirtualTunDevice::new(tun.capabilities()); + let builder = InterfaceBuilder::new(virt); + let ip_addrs = [ + IpCidr::new(IpAddress::v4(0, 0, 0, 1), 0), + ]; + + let mut routes = Routes::new(BTreeMap::new()); + routes.add_default_ipv4_route(Ipv4Address::new(0, 0, 0, 1)).unwrap(); + + + let iface = builder.any_ip(true) + .ip_addrs(ip_addrs).routes(routes).finalize(); + + + Self { + tun, + poll, + tun_token, + udp_token: Token(1), + iface, + connections: Default::default(), + next_token: 2, + token_to_connection: Default::default(), + socketset: SocketSet::new([]), + managers: Default::default(), + connection_managers: Default::default() + } + } + + pub(crate) fn add_connection_manager(&mut self, manager: Box) { + self.connection_managers.push(manager); + } + + fn expect_smoltcp_send(&mut self) { + self.iface.poll(&mut self.socketset, Instant::now()).unwrap(); + + while let Some(vec) = self.iface.device_mut().exfiltrate_packet() { + let slice = vec.as_slice(); + + // TODO: Actual write. Replace. + self.tun.transmit().unwrap().consume(Instant::now(), slice.len(), |buf| { + buf[..].clone_from_slice(slice); + Ok(()) + }).unwrap(); + } + } + + fn remove_connection(&mut self, connection: &Connection) { + self.managers.remove(connection); + let mut connection_state = self.connections.remove(connection).unwrap(); + self.token_to_connection.remove(&connection_state.token); + self.poll.registry().deregister(&mut connection_state.mio_stream).unwrap(); + println!("[{:?}] CLOSE {} -> {} (TCP)", chrono::offset::Local::now(), connection.src, connection.dst); + } + + fn get_connection_manager(&self, connection: &Connection) -> Option<&Box>{ + for manager in self.connection_managers.iter() { + if manager.handles_connection(connection) { + return Some(manager); + } + } + None + } + + fn tunsocket_read_and_forward(&mut self, connection: &Connection) { + if let Some(handler) = self.managers.get_mut(&connection) { + let closed = { + let conn_info = self.connections.get_mut(&connection).unwrap(); + let mut socket = self.socketset.get::(conn_info.smoltcp_handle); + while socket.can_recv() { + socket.recv(|data| { + let event = IncomingDataEvent { + direction: IncomingDirection::FromClient, + buffer: data, + + }; + handler.push_data(event); + + (data.len(), ()) + }).unwrap(); + } + + socket.state() == smoltcp::socket::TcpState::CloseWait + }; + + if closed { + let connection_state = self.connections.get_mut(&connection).unwrap(); + connection_state.mio_stream.shutdown(Shutdown::Both).unwrap(); + self.remove_connection(&connection); + return; + } + } + } + + fn receive_tun(&mut self, frame: &mut [u8]) { + if let Some((connection, first_packet, _payload_offset, _payload_size)) = connection_tuple(frame) { + + if connection.proto == smoltcp::wire::IpProtocol::Tcp.into() { + let cm = self.get_connection_manager(&connection); + if !cm.is_some() { + return; + } + let server = cm.unwrap().get_server(); + if first_packet { + let mut socket = TcpSocket::new(TcpSocketBuffer::new(vec![0; 4096]), TcpSocketBuffer::new(vec![0; 4096])); + socket.set_ack_delay(None); + socket.listen(connection.dst).unwrap(); + let handle = self.socketset.add(socket); + + let socket = MioTcp::new_v4().unwrap(); + let client = socket.connect(server).unwrap(); + + let token = Token(self.next_token); + self.next_token += 1; + + let mut conn = ConnectionState { + smoltcp_handle: handle, + mio_stream: client, + token + }; + + self.token_to_connection.insert(token, connection); + self.poll.registry().register(&mut conn.mio_stream, token, Interest::READABLE | Interest::WRITABLE).unwrap(); + + self.connections.insert(connection, conn); + + for manager in self.connection_managers.iter_mut() { + if let Some(handler) = manager.new_connection(&connection) { + self.managers.insert(connection, handler); + break; + } + } + + + println!("[{:?}] CONNECT {} -> {} (TCP)", chrono::offset::Local::now(), connection.src, connection.dst); + } else if !self.connections.contains_key(&connection) { + return; + } + + // Inject the packet to advance the smoltcp socket state + self.iface.device_mut().inject_packet(frame); + + // Having advanced the socket state, we expect the socket to ACK + // Exfiltrate the response packets generated by the socket and inject them + // into the tunnel interface. + self.expect_smoltcp_send(); + + // Read from the smoltcp socket and push the data to the connection handler. + self.tunsocket_read_and_forward(&connection); + + // The connection handler builds up the connection or encapsulates the data. + // Therefore, we now expect it to write data to the server. + self.write_to_server(&connection); + } + else if connection.proto == smoltcp::wire::IpProtocol::Udp.into() { + /* // UDP is not yet supported. + if payload_offset > frame.len() || payload_offset + payload_offset > frame.len() { + return; + } + let payload = &frame[payload_offset..payload_offset+payload_size]; */ + } + } + } + + fn write_to_server(&mut self, connection: &Connection) { + if let Some(handler) = self.managers.get_mut(&connection) { + let event = handler.peek_data(OutgoingDirection::ToServer); + if event.buffer.len() == 0 { + return; + } + let connection_state = self.connections.get_mut(&connection).unwrap(); + let result = connection_state.mio_stream.write(event.buffer); + match result { + Ok(consumed) => { + handler.consume_data(OutgoingDirection::ToServer, consumed); + } + Err(error) if error.kind() != std::io::ErrorKind::WouldBlock => { + panic!("Error: {:?}", error); + } + _ => { + // println!("{:?}", result); + } + } + } + } + + fn write_to_client(&mut self, connection: &Connection) { + if let Some(handler) = self.managers.get_mut(&connection) { + let event = handler.peek_data(OutgoingDirection::ToClient); + let socket = &mut self.socketset.get::(self.connections.get(&connection).unwrap().smoltcp_handle); + if socket.may_send() { + let consumed = socket.send_slice(event.buffer).unwrap(); + handler.consume_data(OutgoingDirection::ToClient, consumed); + } + } + } + + fn tun_event(&mut self, event: &Event) { + if event.is_readable() { + while let Some((rx_token, _)) = self.tun.receive() { + if let Err(err) = rx_token.consume(Instant::now(), |frame| { + self.receive_tun(frame); + Ok(()) + }) { + panic!("Error: {}", err); + } + } + } + } + + fn mio_socket_event(&mut self, event: &Event) { + let connection = *self.token_to_connection.get(&event.token()).unwrap(); + + if event.is_read_closed() { + { + let mut socket = self.socketset.get::(self.connections.get(&connection).unwrap().smoltcp_handle); + socket.close(); + } + self.expect_smoltcp_send(); + self.remove_connection(&connection.clone()); + return; + } + + if event.is_readable() { + { + let conn = self.managers.get_mut(&connection).unwrap(); + let state = self.connections.get_mut(&connection).unwrap(); + + let mut buf = [0u8; 4096]; + let read = state.mio_stream.read(&mut buf).unwrap(); + + let event = IncomingDataEvent { + direction: IncomingDirection::FromServer, + buffer: &buf[0..read], + + }; + conn.push_data(event); + } + + // We have read from the proxy server and pushed the data to the connection handler. + // Thus, expect data to be processed (e.g. decapsulated) and forwarded to the client. + + //self.expect_smoltcp_send(); + self.write_to_client(&connection); + self.expect_smoltcp_send(); + } + if event.is_writable() { + self.write_to_server(&connection); + } + } + + fn udp_event(&mut self, _event: &Event) { + + } + + pub(crate) fn run(&mut self) { + + let mut events = Events::with_capacity(1024); + + loop { + self.poll.poll(&mut events, None).unwrap(); + for event in events.iter() { + if event.token() == self.tun_token { + self.tun_event(event); + } else if event.token() == self.udp_token { + self.udp_event(event); + } else { + self.mio_socket_event(event); + } + } + } + } +} \ No newline at end of file diff --git a/src/virtdevice.rs b/src/virtdevice.rs new file mode 100644 index 0000000..dfd485f --- /dev/null +++ b/src/virtdevice.rs @@ -0,0 +1,80 @@ +use smoltcp::phy; +use smoltcp::phy::{Device, DeviceCapabilities}; +use smoltcp::time::Instant; + +#[derive(Default)] +pub struct VirtualTunDevice { + capabilities: DeviceCapabilities, + inbuf: Vec>, + outbuf: Vec> +} + + +impl VirtualTunDevice { + pub fn inject_packet(self: &mut Self, buffer: &[u8]) { + let vec = Vec::from(buffer); + self.inbuf.push(vec); + } + + pub fn exfiltrate_packet(self: &mut Self, ) -> Option> { + self.outbuf.pop() + } +} + +pub struct VirtRxToken { + buffer: Vec, +} + +impl phy::RxToken for VirtRxToken { + fn consume(mut self, _timestamp: Instant, f: F) -> smoltcp::Result + where + F: FnOnce(&mut [u8]) -> smoltcp::Result, + { + f(&mut self.buffer[..]) + } +} + +pub struct VirtTxToken<'a>(&'a mut VirtualTunDevice); + +impl<'a> phy::TxToken for VirtTxToken<'a> { + fn consume(self, _timestamp: Instant, len: usize, f: F) -> smoltcp::Result + where + F: FnOnce(&mut [u8]) -> smoltcp::Result, + { + let mut buffer = vec![0; len]; + let result = f(&mut buffer); + self.0.outbuf.push(Vec::from(buffer)); + result + } +} + +impl<'a> Device<'a> for VirtualTunDevice { + type RxToken = VirtRxToken; + type TxToken = VirtTxToken<'a>; + + fn receive(&'a mut self) -> Option<(Self::RxToken, Self::TxToken)> { + if let Some(buffer) = self.inbuf.pop() { + let rx = Self::RxToken { buffer }; + let tx = VirtTxToken(self); + return Some((rx, tx)); + } + None + } + + fn transmit(&'a mut self) -> Option { + return Some(VirtTxToken(self)); + } + + fn capabilities(&self) -> DeviceCapabilities { + self.capabilities.clone() + } +} + +impl<'a> VirtualTunDevice { + pub fn new(capabilities: DeviceCapabilities) -> Self { + Self { + capabilities, + ..Default::default() + } + } +} \ No newline at end of file